[93.05] Study of Umbral Dots at 1.6 Micron

We used a 320 by 240 InGaAs IR camera and a broadband filter
centered at 1.565 micron to carry out a sequence of near IR
observations at Big Bear Solar Observatory. The target is a
delta sunspot and our objective is to study the properties
of umbral dots in the opacity minimum. Because of the lower
scattering light in IR, we can resolve the very center of
the umbra. We discuss the contrasts, sizes, lifetimes and
proper motions of umbral dots observed in IR and compared
with visible observations.

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